New Delhi: The market cap of 8 out of the 10 largest companies in the country has dropped by Rs 1.66 lakh crore in the last weeks trading. Tata Consultancy Services (TCS) the countrys second-most valuable company was the top loser during the period. According to the reports the companys market cap has fallen by Rs 53186 crore to Rs 13.70 lakh crore. Apart from this the value of Bharti Airtel ICICI Bank Hindustan Unilever (HUL) Infosys ITC HDFC Bank and State Bank of India (SBI) has fallen. However it is important to note that the market cap of the countrys largest company Reliance Industries in terms of market value has increased by Rs 14547 crore to Rs 16.61 lakh crore. The value of Bajaj Finance a company that recently joined the top-10 has increased by Rs 384 crore to Rs 5.20 lakh crore. Last week the Sensex fell by 628 points. On the last trading day the Sensex closed at 75311 with a fall of 424 points. Nifty also fell by 117 points and closed at 22795. Out of the 30 Sensex stocks 22 fell and 8 rose. Out of the 50 Nifty stocks 37 fell and 13 rose. The auto sector of the NSE sectoral index saw the maximum fall of 2.58 percent. For the week the Sensex fell by a total of 628 points. Nifty fell by 133 points. What is market capitalization? Market capitalization (market cap) represents the total value of a companys outstanding shares meaning all shares currently held by its shareholders. It is determined by multiplying the companys total number of issued shares by its stock price. Market cap is used to categorise company stocks to help investors choose them based on their risk profile such as large cap mid cap and small cap companies. Market cap = (number of shares outstanding) x (price of shares) How does market cap work? Whether a companys stock will give profit or not is estimated by looking at several factors. One of these factors is market cap. Investors can find out how big the company is by looking at the market cap. The higher the market cap of a company the better it is considered to be. Stock prices rise and fall according to demand and supply. Therefore market cap is the public perceived value of that company.